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Configuring Traffic Filters and Protocol Prioritization
5-2 117348-A Rev. A
Specifying MAC Address Ranges
When you create a traffic filter that includes a Source or Destination MAC
Address criterion, you specify the MAC address range in either canonical format
or most significant bit (MSB) format. T
able 5-1 lists the MAC address formats.
The following sections provide information about specifying SRB source MAC
addresses and functional MAC addresses.
SRB Source MAC Addresses
Consider the following when specifying source MAC addresses for SRB traffic
filters:
Set the MSB to 1 by adding the First Bit Set MAC Address
(0x800000000000) to the source MAC address.
For example, to filter token ring packets with the source MAC address of
0x400037450440, first add 0x800000000000. Then, specify the result,
0xC00037450440, as the criteria range.
If you use a sniffer to analyze packets for their source MAC address, keep in
mind that the routing information indicator (RII) is set to 1 if the routing
information field (RIF) is present, and is set to 0 if there is no RIF.
Bit 0 (the 0x80 bit) of byte 0 (the leftmost byte) is the RII bit, which indicates
the presence of the RIF bit. For example, a sniffer decodes LAA with the first
byte of 40 as 0x400031740001. If the RIF bit is set, the hexadecimal value of
the packet is 0xC00031740001.
a. For example, to drop the address 0x123456789ABC, specify the filter range in bit-swapped
format: 0x482C6A1E593D.
Table 5-1. Format for Specifying MAC Addresses
Address Type Address Format
PPP MSB
Bay Networks Standard Frame Relay Canonical
Bay Networks Proprietary PPP Canonical
Token ring MSB
a
Ethernet Canonical
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